Maintenance inspector reported discovering a cracked engine cylinder on a cessna 414A.

Attributes
ACN	1602230
Time
Date	201811
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	Chancellor 414A / C414
Component
Aircraft Component	Cylinder
Person 1
Function	Inspector
Qualification	Maintenance Powerplant Maintenance Airframe Maintenance Inspection Authority
Experience	Maintenance Inspector 4.5 Maintenance Technician 10
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy

Narrative:

Was performing annual inspection on a cessna twin and discovered a cracked cylinder. Research revealed related ads for this model of cessna; however this plane in question is outside the serial range of the ad. I believe the serial range should be extended to include these later serial numbers as it is a serious issue and others could be affected. Reference airworthiness directive 2016-16-12.

Original NASA ASRS Text

Title: Maintenance Inspector reported discovering a cracked engine cylinder on a Cessna 414A.

Narrative: Was performing annual inspection on a Cessna twin and discovered a cracked cylinder. Research revealed related ADs for this model of Cessna; however this plane in question is outside the serial range of the AD. I believe the serial range should be extended to include these later serial numbers as it is a serious issue and others could be affected. Reference Airworthiness Directive 2016-16-12.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.